Explain me 10 common heart diseases with ecg changes and ecg images of those diseases
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Now let me search the medical library and for ECG images in parallel:
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ECG electrocardiogram myocardial infarction ST elevation
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ECG atrial fibrillation electrocardiogram
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ECG heart block complete third degree atrioventricular
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ECG ventricular tachycardia wide complex tachycardia
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ECG hypertrophic cardiomyopathy left ventricular hypertrophy
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ECG pericarditis saddle shaped ST elevation diffuse
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ECG Wolff Parkinson White syndrome delta wave pre-excitation
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ECG dilated cardiomyopathy left bundle branch block
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ECG pulmonary embolism right heart strain S1Q3T3 pattern
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ECG hyperkalemia peaked T waves sine wave
I now have excellent ECG images for all 10 diseases. Let me compile the comprehensive response.Here is a comprehensive guide to 10 common heart diseases with their ECG changes and images:
10 Common Heart Diseases: ECG Changes & Images
1. ST-Elevation Myocardial Infarction (STEMI)
Overview: Acute complete occlusion of a coronary artery causing transmural myocardial ischemia and necrosis.
ECG Changes:
- Hyperacute T waves — earliest sign; tall, peaked, broad-based T waves in the affected territory
- ST-segment elevation ≥1 mm in ≥2 contiguous limb leads or ≥2 mm in precordial leads, with convex ("tombstone") morphology
- Reciprocal ST depression in anatomically opposite leads
- Pathological Q waves — develop hours to days later (>40 ms wide, >25% of R-wave height)
- T-wave inversion in the subacute phase
Localisation:
| Territory | Leads with STE | Culprit artery |
|---|---|---|
| Anterior | V1–V4 | LAD |
| Lateral | I, aVL, V5–V6 | LCx |
| Inferior | II, III, aVF | RCA |
| Posterior | ST depression V1–V3 + tall R in V1 | RCA/LCx |
Anterior STEMI: convex ST elevation V1–V6, hyperacute T waves, reciprocal inferior depression — LAD occlusion.
Inferolateral STEMI: ST elevation in II, III, aVF, and V4–V6 with reciprocal depression in I, aVL, and anterior leads.
2. Atrial Fibrillation (AF)
Overview: Disorganized atrial electrical activity causing irregular ventricular response; the most common sustained arrhythmia.
ECG Changes:
- Absent P waves — replaced by fibrillatory (f) waves, best seen in V1 and lead II
- Irregularly irregular RR intervals — the hallmark finding
- Narrow QRS complexes (unless aberrant conduction or bundle branch block coexists)
- Ventricular rate varies: rapid (>100 bpm, uncontrolled), controlled (60–100 bpm), or slow (<60 bpm in over-treatment)
Classic AF: complete absence of P waves, irregular RR intervals, fine f-waves visible in V1 and the rhythm strip.
3. Complete (Third-Degree) AV Heart Block
Overview: Total failure of impulse conduction from atria to ventricles; atria and ventricles beat independently.
ECG Changes:
- Complete AV dissociation — P waves and QRS complexes bear no fixed relationship
- P-P intervals regular (atrial rate faster, usually 60–100 bpm)
- RR intervals regular but slow (ventricular escape rhythm)
- Escape QRS morphology depends on escape focus:
- Junctional escape (nodal block): narrow QRS, rate 40–60 bpm
- Ventricular escape (infra-Hisian): wide QRS, rate 20–40 bpm
- Secondary ST-T changes discordant with the QRS
Complete heart block: slow wide-complex ventricular escape ~44 bpm, P waves completely independent of QRS complexes.
4. Ventricular Tachycardia (VT)
Overview: Life-threatening arrhythmia originating below the Bundle of His; most commonly in structural heart disease (post-MI scar, cardiomyopathy).
ECG Changes:
- Wide QRS tachycardia (QRS >120 ms), rate typically 100–250 bpm
- AV dissociation — P waves independent of QRS (pathognomonic when visible)
- Fusion beats and capture beats (Dressler beats) — diagnostic
- Concordance in precordial leads (all positive or all negative) supports VT over SVT with aberrancy
- Monomorphic VT: regular uniform QRS; Polymorphic VT: beat-to-beat QRS variation
- Torsades de pointes: twisting of QRS axis around the isoelectric line, often on long QT background
Monomorphic VT: wide QRS complexes, positive concordance V1–V6, no visible P waves, regular rapid rate.
5. Hypertrophic Cardiomyopathy (HCM)
Overview: Genetic sarcomere disease causing asymmetric left ventricular hypertrophy, often with outflow tract obstruction; leading cause of sudden cardiac death in young athletes.
ECG Changes:
- Left ventricular hypertrophy (LVH) — Sokolow–Lyon criteria (SV1 + RV5/V6 ≥35 mm)
- Deep, symmetric T-wave inversions — especially in apical HCM (Yamaguchi variant) with giant T inversions V2–V5
- "Strain pattern" — ST depression + T-wave inversion in lateral leads (I, aVL, V5–V6)
- Absent septal Q waves in I, aVL, V5, V6 (due to abnormal septal depolarisation)
- Left axis deviation
- Abnormal P-wave morphology if left atrial enlargement is present
HCM (septal variant): high-amplitude R waves V2–V4, deep T-wave inversions V2–V6 with strain pattern, absent septal Q waves.
Apical HCM: "giant" deep symmetric T-wave inversions V2–V5 with LVH voltage — classic Yamaguchi pattern.
6. Acute Pericarditis
Overview: Inflammation of the pericardium, typically viral; presents with sharp pleuritic chest pain relieved by leaning forward.
ECG Changes (4 Stages):
- Stage 1 (acute): Diffuse concave ("saddle-shaped") ST elevation in all leads except aVR and V1 + PR depression (most specific sign) — PR elevation in aVR
- Stage 2 (days): ST normalises, T waves flatten
- Stage 3 (1–2 weeks): Diffuse T-wave inversions
- Stage 4 (weeks–months): ECG normalises
Key distinguishing features from STEMI:
- ST elevation is diffuse (not in one coronary territory)
- ST morphology is concave up (not convex)
- PR depression is present
- No reciprocal changes (except aVR)
- Spodick's sign — downsloping TP segment
Acute pericarditis: diffuse concave ST elevation in I, II, III, aVF, V2–V6, PR depression in lead II, PR elevation in aVR, sinus tachycardia.
7. Wolff-Parkinson-White (WPW) Syndrome
Overview: Accessory AV pathway (Bundle of Kent) allows ventricular pre-excitation; predisposes to SVT and, in AF, potentially life-threatening rapid conduction.
ECG Changes:
- Short PR interval (<120 ms) — accessory pathway bypasses AV node
- Delta wave — slurred upstroke of QRS (initial slow ventricular depolarisation through myocardium)
- Widened QRS (>120 ms) — sum of delta wave + normal conduction
- Secondary ST-T changes discordant to QRS
- Pseudo-infarct patterns — negative delta waves in inferior leads (II, III, aVF) simulate Q waves
- Pathway location can be inferred from delta wave polarity in different leads
WPW: shortened PR interval, classic delta waves (red arrows in leads II, III), widened QRS with secondary ST-T changes.
8. Dilated Cardiomyopathy (DCM)
Overview: Enlarged, weakened left ventricle with reduced ejection fraction; causes include ischemia, viral myocarditis, alcohol, genetic mutations.
ECG Changes:
- Left bundle branch block (LBBB) — broad notched R in I, aVL, V5, V6; deep rS in V1–V3; secondary discordant ST-T changes
- Left ventricular hypertrophy criteria
- Sinus tachycardia — compensatory
- Poor R-wave progression in precordial leads
- Atrial fibrillation — common complication
- Fragmented QRS (fQRS) — multiple deflections within QRS, marker of fibrosis/scar
- Pathological Q waves mimicking prior MI
LBBB in DCM: QRS >120 ms, deep rS in V1–V3, broad monophasic R in lateral leads (I, V5–V6), discordant ST depression.
9. Pulmonary Embolism (PE)
Overview: Obstruction of pulmonary arteries causing acute right ventricular pressure overload and strain.
ECG Changes:
- Sinus tachycardia — most common finding (present in ~44% of PE)
- S1Q3T3 pattern (McGinn-White sign) — S wave in lead I, Q wave and T-wave inversion in lead III; present in ~20% of cases
- T-wave inversions in V1–V4 — right ventricular strain pattern
- Right bundle branch block (complete or incomplete) — acute RV dilatation
- Right axis deviation
- P pulmonale — peaked P waves in lead II (right atrial enlargement)
- Atrial fibrillation/flutter — can occur acutely
- Normal ECG does not exclude PE
Acute PE: S1Q3T3 pattern annotated with circles — prominent S wave lead I, Q wave lead III, T-wave inversion lead III; sinus tachycardia.
PE with RV strain: S1Q3T3, T-wave inversions V1–V3, incomplete RBBB (QRS 110 ms), sinus tachycardia ~116 bpm.
10. Hyperkalemia (Cardiac Effects)
Overview: Elevated serum potassium disrupts cardiac membrane potential; life-threatening at K⁺ >6.5–7.0 mmol/L.
ECG Changes (progressive with rising K⁺):
| K⁺ level | ECG Change |
|---|---|
| 5.5–6.5 mmol/L | Tall peaked "tented" T waves — narrow base, symmetric |
| 6.5–7.0 mmol/L | PR prolongation, P-wave flattening/disappearance |
| 7.0–8.0 mmol/L | QRS widening — intraventricular conduction delay |
| >8.0 mmol/L | Sine-wave pattern — QRS merges with T wave; pre-arrest |
| Terminal | Ventricular fibrillation → asystole |
Severe hyperkalemia: prominently peaked T waves in inferior and precordial leads, widened QRS complexes, flattened P waves.
Quick Reference Summary
| Disease | Key ECG Feature |
|---|---|
| STEMI | Convex ST elevation + reciprocal depression + Q waves |
| Atrial Fibrillation | No P waves + irregularly irregular RR |
| Complete Heart Block | AV dissociation + slow escape rhythm |
| Ventricular Tachycardia | Wide QRS tachycardia + AV dissociation |
| HCM | LVH + strain + giant T inversions (apical) |
| Pericarditis | Diffuse concave STE + PR depression (Spodick's sign) |
| WPW | Short PR + delta wave + wide QRS |
| DCM | LBBB + poor R progression + fQRS |
| Pulmonary Embolism | Sinus tachycardia + S1Q3T3 + RV strain |
| Hyperkalemia | Peaked T waves → QRS widening → sine wave |
Clinical note: ECG findings must always be interpreted in the clinical context. A single tracing rarely tells the whole story — serial ECGs, troponin levels, echocardiography, and patient history are all essential parts of the workup.Here's a summary of what was covered across the 10 diseases:
Diseases covered with ECG changes and images:
- STEMI — Convex ST elevation by territory (anterior, inferolateral), hyperacute T waves, reciprocal changes, Q waves
- Atrial Fibrillation — Absent P waves, irregularly irregular RR intervals, fibrillatory baseline
- Complete (3rd Degree) AV Block — Total AV dissociation, slow ventricular escape, P waves independent of QRS
- Ventricular Tachycardia — Wide complex tachycardia, AV dissociation, concordance, fusion/capture beats
- Hypertrophic Cardiomyopathy — LVH voltage, strain pattern, giant T inversions (apical variant / Yamaguchi)
- Acute Pericarditis — Diffuse saddle-shaped ST elevation, PR depression, Spodick's sign, 4 evolutionary stages
- WPW Syndrome — Short PR, delta wave, widened QRS, pseudo-infarct patterns
- Dilated Cardiomyopathy — LBBB, poor R-wave progression, fragmented QRS, AF
- Pulmonary Embolism — S1Q3T3, sinus tachycardia, RV strain (T inversions V1–V4), RBBB
- Hyperkalemia — Progressive changes from peaked T waves → PR prolongation → QRS widening → sine wave → VF
Each section includes real ECG images from peer-reviewed medical literature with annotated descriptions of the diagnostic features.
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